HankMoody

the island is the cork that keeps MIB locked away. In the
alternative universe the island is underwater, thus the "cork"
isn't working anymore...

After watching the episode I was pretty surprised that we got such
a straight forward explanation of things. Also the good verses evil
thing. That got me thinking what if MIB isn't evil afterall. If my
theory works out he wouldn't be evil at all, since so far
everything in the Alternative universe seems to be better.

so, the end of the show might be that the MIB succeeds and escapes.
this would eventually cause the alternative universe.

On a different matter, it looks to me like he is unable to kill
candidates himself, as they are the ones that could replace jacob.
so maybe in order to get free, Ja…